help passing a drug test

Have a DT coming in about 20 days for my po. I have been clean for a year and a half. Smoked for 6 days ( 4-5 bowls a day). Now I've been clean for 7 days. Want to know if I'll be clean by the end of my 20 days(27 days total of being clean). Really need to pass! Any help is welcomed.
P.S. I'm...

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